会议名称：“2025世界木材日”研讨会暨第七届国际林联（IUFRO）林产品文化研究组讨论会
会议时间：2025年3月18日

报告嘉宾： Kaori Fujita
嘉宾单位：日本东京大学 教授

报告题目：Vibration Measurement and Application to Structural Health Monitoring of Timber Post and Beam Structures in Norway and Japan -Vibration measurements of Borgund Stave Church

报告摘要：
The application of vibrational measurements in structural health monitoring (SHM) is of prime interest in terms of maintaining architectural heritage as a non-destructive testing method for extremely long-lived architecture. Studies have been conducted in recent years based on this method on architectural heritage structures. However, the main target of these studies are masonry and application to timber structures are few. The authors have been conducting vibration monitoring on several historical timber structures in Japan over 10 years and the results show high potential for application to SHM, by considering the heat-humidity environment of the timber structures. 
This study was realized by the joint research by timber engineers and architectural historians in Norway and Japan. The two countries share important characteristics from the perspective of architecture: the richness in timber resources, technological advancement in timber engineering and the existence of ancient architectural heritage of timber post and beam construction. The climatic conditions are totally different for the two countries; Norway being boreal to hemi boreal whereas Japan being temperate humid. Thus these two countries provide ideal fields to study the influence of climatic conditions on the vibration characteristic of historical timber post and beam construction. The target of the experiment were on Norwegian Stave Churches, which are of post and beam construction some remaining from the 12th century. In this paper the results of vibration measurement on Borgund Stave Church is presented. 
Together with vibration measurement, temperature, humidity and 3D scanning were conducted. Fundamental vibration characteristics were determined through vibration measurement, and it show consistency with the relation of the height of the structure as these structures have similar structural system and morphology. The dependency of displacement, temperature and humidity which are important factors to consider for structural health monitoring is analyzed and discussed.

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